Hi,
Apologies, the problem wasn't properly minimised because I had some trouble
wrapping my head around it. Here's two complete examples which I hope can
explain the problem better this time.
1) This works:
[CMakeLists.txt]
cmake_minimum_required(VERSION 3.6)
project(Test)
add_library(lib1-obj OBJECT lib1.cpp)
add_library(lib1 INTERFACE)
set_target_properties(lib1 PROPERTIES INTERFACE_SOURCES
$<TARGET_OBJECTS:lib1-obj>)
add_library(lib2 lib2.cpp)
target_link_libraries(lib2 lib1)
add_executable(main main.cpp)
target_link_libraries(main lib2)
2) But this does not:
[CMakeLists.txt]
cmake_minimum_required(VERSION 3.6)
project(Test)
add_library(lib1-obj OBJECT lib1.cpp)
add_library(lib1 INTERFACE)
set_target_properties(lib1 PROPERTIES INTERFACE_SOURCES
$<TARGET_OBJECTS:lib1-obj>)
add_library(lib2 lib2.cpp)
target_link_libraries(lib2 lib1)
add_subdirectory(main)
[main/CMakeLists.txt]
add_executable(main main.cpp)
target_link_libraries(main lib2)
With the second example, I get an error "cannot find source file lib1.cpp.o
tried extensions...".
Thanks,
-- Giovanni
On Thu, Dec 8, 2016 at 9:56 PM, Stephen Kelly <steve...@gmail.com> wrote:
> Giovanni Funchal wrote:
>
> > Hi,
> >
> > The help page [1] mentions that:
> >
> >> Although object libraries may not be named directly in calls to the
> >> target_link_libraries() command, they can be “linked” indirectly by
> >> using an Interface Library whose INTERFACE_SOURCES target property
> >> is set to name $<TARGET_OBJECTS:objlib>.
> >
> > However, I was unable to get this to work. Doing this:
> >
> > add_library(lib-obj OBJECT test.cpp)
> > add_library(lib INTERFACE)
> > add_dependencies(lib lib-obj)
> > set_target_properties(lib PROPERTIES INTERFACE_SOURCES
> > $<TARGET_OBJECTS:lib-obj>)
> >
> > And then trying to specify lib in link_libraries of an executable yields
> > an error message "Cannot find source file: ... Tried extensions:... ".
> >
> > Am I doing something wrong?
>
> This works for me:
>
> cmake_minimum_required(VERSION 3.3)
>
> project(testit CXX)
>
> add_library(lib-obj OBJECT foo.cpp)
> add_library(lib-iface INTERFACE)
> set_target_properties(lib-iface PROPERTIES
> INTERFACE_SOURCES $<TARGET_OBJECTS:lib-obj>
> )
> add_executable(main foo-user.cpp)
> target_link_libraries(main lib-iface)
>
>
> Thanks,
>
> Steve.
>
>
> --
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